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Cheap flights from Ottawa to Illinois from C$ 148

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
28 Nov — 5 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Ottawa to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from Ottawa to Illinois
Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 October 2025.

Fri 5/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Fri 5/124:15 p.m.MDW - YOW
1 stop3h 39mPorter Airlines
Deal found 28/10C$ 359
Thu 4/129:30 a.m.YOW - ORD
3 stops26h 43mMultiple Airlines
Mon 8/125:00 a.m.ORD - YOW
1 stop18h 25mMultiple Airlines
Deal found 28/10C$ 379
Mon 10/114:15 p.m.YOW - ORD
2 stops25h 00mMultiple Airlines
Mon 17/117:34 p.m.ORD - YOW
1 stop16h 01mMultiple Airlines
Deal found 28/10C$ 433
Thu 4/1212:10 p.m.YOW - MDW
1 stop4h 10mPorter Airlines
Mon 8/124:15 p.m.MDW - YOW
1 stop5h 14mPorter Airlines
Deal found 29/10C$ 437
Mon 1/126:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Sat 6/1212:45 p.m.MDW - YOW
1 stop3h 44mPorter Airlines
Deal found 29/10C$ 439
Tue 11/114:15 p.m.YOW - ORD
1 stop9h 12mMultiple Airlines
Wed 12/113:26 p.m.ORD - YOW
1 stop24h 59mMultiple Airlines
Deal found 28/10C$ 440
Tue 11/114:15 p.m.YOW - ORD
1 stop9h 12mMultiple Airlines
Mon 17/117:34 p.m.ORD - YOW
2 stops20h 55mMultiple Airlines
Deal found 28/10C$ 443
Fri 5/1212:10 p.m.YOW - MDW
1 stop4h 10mPorter Airlines
Sun 7/1211:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 29/10C$ 447
Mon 1/1212:10 p.m.YOW - MDW
1 stop4h 10mPorter Airlines
Fri 5/124:15 p.m.MDW - YOW
1 stop3h 39mPorter Airlines
Deal found 26/10C$ 456
Tue 11/113:55 p.m.YOW - MDW
1 stop9h 00mMultiple Airlines
Thu 13/116:26 p.m.MDW - YOW
2 stops16h 03mMultiple Airlines
Deal found 28/10C$ 463
Mon 24/116:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Mon 1/124:15 p.m.MDW - YOW
1 stop3h 39mPorter Airlines
Deal found 26/10C$ 464
Wed 26/116:50 a.m.YOW - MDW
1 stop4h 15mPorter Airlines
Wed 3/1211:00 a.m.MDW - YOW
1 stop5h 29mPorter Airlines
Deal found 29/10C$ 468

Cheap flight deals from Ottawa to Illinois

Keep the following information in mind while searching for Ottawa to Illinois flight deals. Data was last updated 29 October 2025.

Round-trip from

C$ 335

One-way from

C$ 148

Popular in

November

Cheapest in

May

Average price

C$ 583

Good round-trip deal

C$ 541 or less

Good one-way deal

C$ 383 or less
Porter Airlines
  • Porter Airlines
  • 28/1-3/2
  • 2 total stops
  • 9h 34m total
  • Ottawa to Illinois
Search Deals
Porter Airlines
  • Porter Airlines
  • 5/12
  • 1 total stop
  • 4h 10m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 105 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Ottawa to Illinois.
Search Deals
Price to beat on a one-way flight from Ottawa to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 October 2025.
Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Fly from

Ottawa

Fly to

Illinois

Route

Depart

Return

Price

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Wed 28/1

7:00 a.m.-10:05 a.m.

1 stop4h 05m

Chicago Midway

Tue 3/2

11:00 a.m.-5:29 p.m.

1 stop5h 29m

C$ 335

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 23/1

9:30 a.m.-10:33 p.m.

1 stop14h 03m

Lambert-St Louis

Sun 25/1

5:11 p.m.-5:13 p.m.

1 stop23h 02m

C$ 338

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Tue 17/2

7:00 a.m.-10:05 a.m.

1 stop4h 05m

Chicago Midway

Sun 22/2

4:15 p.m.-10:29 p.m.

1 stop5h 14m

C$ 342

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 5/12

6:50 a.m.-10:05 a.m.

1 stop4h 15m

Chicago Midway

Fri 5/12

4:15 p.m.-8:54 p.m.

1 stop3h 39m

C$ 359

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 4/12

4:15 p.m.-12:09 a.m.

1 stop8h 54m

Chicago O'Hare Intl

Mon 8/12

7:10 a.m.-12:25 a.m.

1 stop16h 15m

C$ 386

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 23/1

2:15 p.m.-10:58 p.m.

2 stops9h 43m

Lambert-St Louis

Sun 25/1

9:57 a.m.-9:56 p.m.

2 stops10h 59m

C$ 421

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 7/4

1:30 p.m.-7:48 p.m.

1 stop7h 18m

Lambert-St Louis

Wed 8/4

8:30 a.m.-4:15 p.m.

1 stop6h 45m

C$ 421

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 4/12

12:10 p.m.-3:20 p.m.

1 stop4h 10m

Chicago Midway

Mon 8/12

4:15 p.m.-10:29 p.m.

1 stop5h 14m

C$ 437

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Mon 8/12

6:50 a.m.-10:05 a.m.

1 stop4h 15m

Chicago Midway

Mon 8/12

4:15 p.m.-10:29 p.m.

1 stop5h 14m

C$ 439

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 26/11

4:15 p.m.-4:25 p.m.

1 stop25h 10m

Chicago O'Hare Intl

Wed 3/12

10:12 a.m.-12:42 a.m.

2 stops13h 30m

C$ 443

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/10

Showing 1-10 of 38 results
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Best time to book a flight from Ottawa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ottawa with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Illinois

What is the cheapest month to book a flight from Ottawa to Illinois?

Currently, September is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 183). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 358). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to IL?

Find hourly flight availability from Ottawa to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 October 2025.

A simple way to save on the total cost of your ticket is to fly from Ottawa to Illinois at noon. If you’re flexible enough to do this you can expect to save up to 56% on your trip compared to booking a flight in the morning.

How much does it cost to fly round-trip from Ottawa to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 29 October 2025.
Read reviews from past customers who have flown Porter Airlines,United Airlines, andAir Canada from Ottawa to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
384 reviews
Check prices

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
8.0
Very good
384 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
9,001 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,371 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Crew

8.6

Entertainment

7.0

Food

7.6

Overall

8.0

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ottawa to Illinois?

    Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to Illinois. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

  • How long is the flight from Ottawa to Illinois?

    Porter Airlines and United Airlines can get you from Ottawa to Illinois in just under 4h 05m. Your travel time can differ by up to 5h 38m. There are 1048 km between Ottawa and Illinois. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from Ottawa to Illinois one-way?

    The cheapest airline one-way is Porter Airlines, with whom users have recently found tickets for as low as C$ 148. However, be on the lookout for offers from Air Canada and United Airlines, as they are both options that can get you from Ottawa to Illinois for a low price.

  • What are the most popular routes from Ottawa to Illinois?

    Most travellers choose Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Lambert-St Louis when deciding on the best route from Ottawa to Illinois.

  • What are the most reliable airlines from Ottawa to Illinois?

    Before booking your flight to Illinois from Ottawa, check out the most reliable airlines to get you to your destination on time: GoJet (90%), Avianca (90%), ANA( 90%).

  • What are the cheapest flights from Ottawa to Illinois?

    Looking for the cheapest flight from Ottawa to Illinois? While on average our users pay C$ 1,215, our data indicates the cheapest price to be C$ 247. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 379.

  • Can I find deals for flights from Ottawa to Illinois that include hotel bookings?

    Yes. In addition to deals on Ottawa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Illinois.

  • Can I find deals for business class flights from Ottawa to Illinois?

    Yes. Cheapflights offers flight deals from Ottawa to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ottawa to Illinois?

    Currently, September is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 183). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 358). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ottawa to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Ottawa to Illinois

Discover the top 3 airlines that operate flights from Ottawa to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 375AverageC$ 488FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 470AverageC$ 676FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 497AverageC$ 644FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ottawa to Illinois?

Cheapflights makes it easy to find Ottawa to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Illinois?

Cheapflights helps you find that perfect flight to Illinois from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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